The alleged victim at the centre of an assault trial of Liam Jurrah says he remembers being hit on then head by the former AFL footballer despite being "drunk and dizzy".

Basil Jurrah, 35, began giving his evidence today.

He told the Northern Territory Supreme Court he had been drinking for most of the day before going to the Little Sisters town camp.

He said he was attacked there by Liam Jurrah and another man.

He told the jury Liam Jurrah hit him twice on the head with a machete and three times on the leg with a nulla nulla, while the other man kicked him.

In cross examination, defence lawyer Jon Tippet told Basil Jurrah his testimony conflicted with statements made to police in July last year when he said there were too many people around to know who was hitting him.

The witness agreed.

Earlier in the trial, a key prosecution witness told the court he was not lying to the jury to protect the former AFL player footballer.

Bruno Wilson outlined a different version of events in the Northern Territory Supreme Court than he had given in an earlier statement to police.

Mr Wilson told the court he had lied in the statement made last July when he claimed that Liam Jurrah hit his cousin, Basil Jurrah, during a fight between rival families at the Alice Springs town camp.

Liam Jurrah has pleaded not guilty to unlawfully causing serious harm to Basil Jurrah in March last year.

In court yesterday, Mr Wilson said that while Jurrah was present at the Little Sisters town camp at the time of the clash, he was unarmed and did not assault Basil Jurrah.

Mr Wilson rejected an allegation by prosecutor Stephen Robson that he was lying to protect Liam Jurrah.

He said he felt had pressured by a detective when he gave his original police statement.

Another witness, Murray Woods, said he was hit on the head during the fight, and Liam Jurrah had helped him to another house and looked after him.